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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GtkSocket: GTK+ 2 Reference Manual</title>
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<a href="#GtkSocket.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
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<div class="refentry">
<a name="GtkSocket"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GtkSocket.top_of_page"></a>GtkSocket</span></h2>
<p>GtkSocket — Container for widgets from other processes</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GtkSocket.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
</td>
<td class="function_name">
<a class="link" href="GtkSocket.html#gtk-socket-new" title="gtk_socket_new ()">gtk_socket_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GtkSocket.html#gtk-socket-steal" title="gtk_socket_steal ()">gtk_socket_steal</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GtkSocket.html#gtk-socket-add-id" title="gtk_socket_add_id ()">gtk_socket_add_id</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../html/gdk2-Event-Structures.html#GdkNativeWindow"><span class="returnvalue">GdkNativeWindow</span></a>
</td>
<td class="function_name">
<a class="link" href="GtkSocket.html#gtk-socket-get-id" title="gtk_socket_get_id ()">gtk_socket_get_id</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../html/gdk2-Windows.html#GdkWindow"><span class="returnvalue">GdkWindow</span></a> *
</td>
<td class="function_name">
<a class="link" href="GtkSocket.html#gtk-socket-get-plug-window" title="gtk_socket_get_plug_window ()">gtk_socket_get_plug_window</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkSocket.signals"></a><h2>Signals</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="signal_proto_type">
<col width="300px" class="signal_proto_name">
<col width="200px" class="signal_proto_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="GtkSocket.html#GtkSocket-plug-added" title="The “plug-added” signal">plug-added</a></td>
<td class="signal_flags">Run Last</td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">gboolean</span></td>
<td class="signal_name"><a class="link" href="GtkSocket.html#GtkSocket-plug-removed" title="The “plug-removed” signal">plug-removed</a></td>
<td class="signal_flags">Run Last</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkSocket.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GtkSocket.html#GtkSocket-struct" title="struct GtkSocket">GtkSocket</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GtkSocket.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GObject
<span class="lineart">╰──</span> GInitiallyUnowned
<span class="lineart">╰──</span> <a class="link" href="GtkObject.html" title="GtkObject">GtkObject</a>
<span class="lineart">╰──</span> <a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>
<span class="lineart">╰──</span> <a class="link" href="GtkContainer.html" title="GtkContainer">GtkContainer</a>
<span class="lineart">╰──</span> GtkSocket
</pre>
</div>
<div class="refsect1">
<a name="GtkSocket.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GtkSocket implements
AtkImplementorIface and <a class="link" href="GtkBuildable.html" title="GtkBuildable">GtkBuildable</a>.</p>
</div>
<div class="refsect1">
<a name="GtkSocket.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gtk/gtk.h>
</pre>
</div>
<div class="refsect1">
<a name="GtkSocket.description"></a><h2>Description</h2>
<p>Together with <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a>, <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> provides the ability
to embed widgets from one process into another process
in a fashion that is transparent to the user. One
process creates a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> widget and passes
that widget's window ID to the other process,
which then creates a <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> with that window ID.
Any widgets contained in the <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> then will appear
inside the first application's window.</p>
<p>The socket's window ID is obtained by using
<a class="link" href="GtkSocket.html#gtk-socket-get-id" title="gtk_socket_get_id ()"><code class="function">gtk_socket_get_id()</code></a>. Before using this function,
the socket must have been realized, and for hence,
have been added to its parent.</p>
<div class="example">
<a name="id-1.4.19.3.9.4"></a><p class="title"><b>Example 16. Obtaining the window ID of a socket.</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="n">GtkWidget</span> <span class="o">*</span><span class="n">socket</span> <span class="o">=</span> <span class="n">gtk_socket_new</span> <span class="p">();</span>
<span class="n">gtk_widget_show</span> <span class="p">(</span><span class="n">socket</span><span class="p">);</span>
<span class="n">gtk_container_add</span> <span class="p">(</span><span class="n">GTK_CONTAINER</span> <span class="p">(</span><span class="n">parent</span><span class="p">),</span> <span class="n">socket</span><span class="p">);</span>
<span class="cm">/* The following call is only necessary if one of</span>
<span class="cm"> * the ancestors of the socket is not yet visible.</span>
<span class="cm"> */</span>
<span class="n">gtk_widget_realize</span> <span class="p">(</span><span class="n">socket</span><span class="p">);</span>
<span class="n">g_print</span> <span class="p">(</span><span class="s">"The ID of the sockets window is %#x</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span>
<span class="n">gtk_socket_get_id</span> <span class="p">(</span><span class="n">socket</span><span class="p">));</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><p>Note that if you pass the window ID of the socket to another
process that will create a plug in the socket, you
must make sure that the socket widget is not destroyed
until that plug is created. Violating this rule will
cause unpredictable consequences, the most likely
consequence being that the plug will appear as a
separate toplevel window. You can check if the plug
has been created by using <a class="link" href="GtkSocket.html#gtk-socket-get-plug-window" title="gtk_socket_get_plug_window ()"><code class="function">gtk_socket_get_plug_window()</code></a>. If
it returns a non-<code class="literal">NULL</code> value, then the plug has been
successfully created inside of the socket.</p>
<p>When GTK+ is notified that the embedded window has been
destroyed, then it will destroy the socket as well. You
should always, therefore, be prepared for your sockets
to be destroyed at any time when the main event loop
is running. To prevent this from happening, you can
connect to the <a class="link" href="GtkSocket.html#GtkSocket-plug-removed" title="The “plug-removed” signal"><span class="type">“plug-removed”</span></a> signal.</p>
<p>The communication between a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> and a <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> follows the</p>
<a class="ulink" href="http://www.freedesktop.org/Standards/xembed-spec" target="_top">XEmbed</a><p>protocol. This protocol has also been implemented in other toolkits, e.g.</p>
<span class="application">Qt</span>, allowing the same level of integration
<p>when embedding a <span class="application">Qt</span> widget in GTK or vice versa.</p>
<p>A socket can also be used to swallow arbitrary
pre-existing top-level windows using <a class="link" href="GtkSocket.html#gtk-socket-steal" title="gtk_socket_steal ()"><code class="function">gtk_socket_steal()</code></a>,
though the integration when this is done will not be as close
as between a <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> and a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>.</p>
<div class="note">
The <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> and <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> widgets are currently not available
on all platforms supported by GTK+.
</div>
</div>
<div class="refsect1">
<a name="GtkSocket.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gtk-socket-new"></a><h3>gtk_socket_new ()</h3>
<pre class="programlisting"><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
gtk_socket_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create a new empty <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>.</p>
<div class="refsect3">
<a name="gtk-socket-new.returns"></a><h4>Returns</h4>
<p> the new <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-socket-steal"></a><h3>gtk_socket_steal ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gtk_socket_steal (<em class="parameter"><code><a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_</code></em>,
<em class="parameter"><code><a href="../html/gdk2-Event-Structures.html#GdkNativeWindow"><span class="type">GdkNativeWindow</span></a> wid</code></em>);</pre>
<div class="warning"><p><code class="literal">gtk_socket_steal</code> is deprecated and should not be used in newly-written code.</p></div>
<p>Reparents a pre-existing toplevel window into a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>. This is
meant to embed clients that do not know about embedding into a
<a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>, however doing so is inherently unreliable, and using
this function is not recommended.</p>
<p>The <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> must have already be added into a toplevel window
before you can make this call.</p>
<div class="refsect3">
<a name="gtk-socket-steal.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>wid</p></td>
<td class="parameter_description"><p>the window ID of an existing toplevel window.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-socket-add-id"></a><h3>gtk_socket_add_id ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gtk_socket_add_id (<em class="parameter"><code><a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_</code></em>,
<em class="parameter"><code><a href="../html/gdk2-Event-Structures.html#GdkNativeWindow"><span class="type">GdkNativeWindow</span></a> window_id</code></em>);</pre>
<p>Adds an XEMBED client, such as a <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a>, to the <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>. The
client may be in the same process or in a different process. </p>
<p>To embed a <a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> in a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>, you can either create the
<a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a> with <code class="literal">gtk_plug_new (0)</code>, call
<a class="link" href="GtkPlug.html#gtk-plug-get-id" title="gtk_plug_get_id ()"><code class="function">gtk_plug_get_id()</code></a> to get the window ID of the plug, and then pass that to the
<a class="link" href="GtkSocket.html#gtk-socket-add-id" title="gtk_socket_add_id ()"><code class="function">gtk_socket_add_id()</code></a>, or you can call <a class="link" href="GtkSocket.html#gtk-socket-get-id" title="gtk_socket_get_id ()"><code class="function">gtk_socket_get_id()</code></a> to get the
window ID for the socket, and call <a class="link" href="GtkPlug.html#gtk-plug-new" title="gtk_plug_new ()"><code class="function">gtk_plug_new()</code></a> passing in that
ID.</p>
<p>The <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> must have already be added into a toplevel window
before you can make this call.</p>
<div class="refsect3">
<a name="gtk-socket-add-id.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>window_id</p></td>
<td class="parameter_description"><p>the window ID of a client participating in the XEMBED protocol.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-socket-get-id"></a><h3>gtk_socket_get_id ()</h3>
<pre class="programlisting"><a href="../html/gdk2-Event-Structures.html#GdkNativeWindow"><span class="returnvalue">GdkNativeWindow</span></a>
gtk_socket_get_id (<em class="parameter"><code><a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_</code></em>);</pre>
<p>Gets the window ID of a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> widget, which can then
be used to create a client embedded inside the socket, for
instance with <a class="link" href="GtkPlug.html#gtk-plug-new" title="gtk_plug_new ()"><code class="function">gtk_plug_new()</code></a>. </p>
<p>The <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> must have already be added into a toplevel window
before you can make this call.</p>
<div class="refsect3">
<a name="gtk-socket-get-id.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gtk-socket-get-id.returns"></a><h4>Returns</h4>
<p> the window ID for the socket</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gtk-socket-get-plug-window"></a><h3>gtk_socket_get_plug_window ()</h3>
<pre class="programlisting"><a href="../html/gdk2-Windows.html#GdkWindow"><span class="returnvalue">GdkWindow</span></a> *
gtk_socket_get_plug_window (<em class="parameter"><code><a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_</code></em>);</pre>
<p>Retrieves the window of the plug. Use this to check if the plug has
been created inside of the socket.</p>
<div class="refsect3">
<a name="gtk-socket-get-plug-window.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>a <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gtk-socket-get-plug-window.returns"></a><h4>Returns</h4>
<p>the window of the plug if available, or <code class="literal">NULL</code>. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-14.html#api-index-2.14">2.14</a></p>
</div>
</div>
<div class="refsect1">
<a name="GtkSocket.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GtkSocket-struct"></a><h3>struct GtkSocket</h3>
<pre class="programlisting">struct GtkSocket;</pre>
</div>
</div>
<div class="refsect1">
<a name="GtkSocket.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GtkSocket-plug-added"></a><h3>The <code class="literal">“plug-added”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_,
<span class="type">gpointer</span> user_data)</pre>
<p>This signal is emitted when a client is successfully
added to the socket.</p>
<div class="refsect3">
<a name="GtkSocket-plug-added.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>the object which received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run Last</p>
</div>
<hr>
<div class="refsect2">
<a name="GtkSocket-plug-removed"></a><h3>The <code class="literal">“plug-removed”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
user_function (<a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> *socket_,
<span class="type">gpointer</span> user_data)</pre>
<p>This signal is emitted when a client is removed from the socket.
The default action is to destroy the <a class="link" href="GtkSocket.html" title="GtkSocket"><span class="type">GtkSocket</span></a> widget, so if you
want to reuse it you must add a signal handler that returns <code class="literal">TRUE</code>.</p>
<div class="refsect3">
<a name="GtkSocket-plug-removed.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>socket_</p></td>
<td class="parameter_description"><p>the object which received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GtkSocket-plug-removed.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> to stop other handlers from being invoked.</p>
</div>
<p>Flags: Run Last</p>
</div>
</div>
<div class="refsect1">
<a name="GtkSocket.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GtkPlug.html" title="GtkPlug"><span class="type">GtkPlug</span></a>, <a class="ulink" href="http://www.freedesktop.org/Standards/xembed-spec" target="_top">XEmbed</a></p>
</div>
</div>
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